The inclinometer casing is a fundamental component for subsurface displacement monitoring, designed to guide and maintain the orientation of manual or fixed inclinometer probes along the entire measurement profile. The casing features four longitudinal grooves arranged at 90°, allowing correct probe alignment during measurements and ensuring repeatability and accuracy of inclinometer surveys. Installed inside boreholes or integrated into structural works, the casing deforms together with the monitored soil or structure, allowing displacement and deformation of the monitored profile to be detected over time. Manufactured from high-strength materials such as ABS or aluminum, the casing ensures stability, durability, and corrosion resistance even in aggressive environments. The assembly is completed with accessories such as coupling sleeves, bottom and top caps, and anchors, ensuring correct installation and protection of the casing during installation and operation.